For more complex headers, which can span over columns and/or rows use a `<f:facet name="header">`in the sheet. The facet could be filled with `<tc:out/>` tags to set the names of the header. Such an output field tag may also contain `<tc:gridLayoutConstraint columnSpan="..."/>` or `<tc:gridLayoutConstraint rowSpan="..."/>` to set a span over columns or rows.

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For multi-header sheets, you should consider to use `markup="bordered"` for better appearance.

<tc:sheet value="\#{sheetController.solarList}" var="luminary" rows="11" columns="3fr 2fr 30px 2fr 2fr 2fr 2fr 2fr 2fr" markup="bordered"> <f:facet name="header"> <tc:out value="Name"> <tc:span row="3"/> </tc:out> <tc:out value="Information"> <tc:gridLayoutConstraint columnSpan="2"/> ...